Court and Spark Court and Spark Court and Spark is the sixth studio album by Canadian singer-songwriter Joni Mitchell. It was an immediate commercial and critical success—and remains her most successful album. Released in January 1974, it infuses her folk rock style, which she developed throughout her previous five albums, with jazz inflections. It reached No. 2 in the United States and No. 1 in Canada and eventually received a Double Platinum certification by the RIAA, the highest of Mitchell's career. It also reached the Top 20 in the UK and was voted the best album of the year for 1974 in The
Leader (spark) stages of a lightning stroke, they are characteristic of the development of all long sparks. In the case of a lightning leader, each extension (called a step leader) is typically 10 – 50 meters in length. The branching, visible blue-white discharges from a Tesla Coil are also examples of leaders. Leader (spark) A leader is a hot, highly conductive channel of plasma that plays a critical part during dielectric breakdown within a long electric spark. When a gas is subjected to high voltage stress, the electric field is often quite non-uniform near one, or both, of the high voltage electrodes